Pregnancy can be easily confirmed or excluded with a pregnancy test. Ectopic pregnancy often requires blood pregnancy test to be diagnosed. It doesn't seem to me that you have ectopic pregnancy because ectopic pregnancy is usually manifested dramatically (severe abdominal cramps, vaginal bleeding, shock...) and patients usually don't have time to write posts on the Internet.
Irregular and prolonged bleeding can be side effects from the pills themselves.
You should consult your gynecologist to check all the possible reasons for vaginal bleeding including organic ones (infections, tumors etc.).